The Collaborative International Dictionary of English v.0.48:

Rocoa \Ro"coa\, n. [Cf. F. rocou, roicou, Pg. & Braz, uruc['u].]
   The orange-colored pulp covering the seeds of the tropical
   plant Bixa Orellana, from which annotto is prepared. See
   Annoto.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Annotto \An*not"to\ ([a^]n*n[o^]t"t[-o]), Arnotto \Ar*not"to\
   ([aum]r*n[o^]t"t[-o]), n. [Perh. the native name.]
   A red or yellowish-red dyeing material, prepared from the
   pulp surrounding the seeds of a tree (Bixa orellana)
   belonging to the tropical regions of America. It is used for
   coloring cheese, butter, etc. [Written also Anatto,
   Anatta, Annatto, Annotta, etc.]
   [1913 Webster]